Because it would be his first (and as it turned out, only) full live performances as a solo artist, John put in plenty of rehearsal prior to the "One To One" Willowbrook benefit concerts in August, 1972.
He and Yoko began rehearsing with Elephant's Memory at Butterfly Studios soon after returning to New York from the west coast. August 16th was "One To One Day" in New York City, with Mayor Lindsay making the proclamation at a ceremony attended by John and Yoko with Geraldo Rivera.
Rivera was at the rehearsals on the 18th to tape a series of radio spots for airing on local stations. The concert had sold out within hours of the announcement, so the ads alerted listeners that a matinee show was being added for the same day. Noise complaints from neighbors meant the rehearsals changed venues to the Fillmore East on August 25th.
On the 28th, John and Yoko appeared live on the WABC evening news, chatting with Geraldo at the TV studio and playing a bit of "Give Peace A Chance" rehearsal footage. Another TV report from around that time reminded viewers that tickets for the matinee were still available.
Ready or not, the shows went on as scheduled on August 30th at Madison Square Garden, with both houses being filmed and professionally recorded. Opening acts included Sha Na Na, Stevie Wonder, and Roberta Flack. Edited and remixed versions of the concerts were released on the LP Live In New York City in 1986, as well as on home video:
John, Yoko, and the band had one final commitment in 1972: performing on the annual Muscular Dystrophy Telethon, hosted by Jerry Lewis and airing from the Americana Hotel in New York. The night before their appearance, September 3rd, they were interviewed in their hotel room by Roy Carr of the New Musical Express.
On the evening of September 4th, John and Yoko appeared live on the telethon, performing "Imagine", "Now Or Never", and "Give Peace A Chance". It would be the last time the couple performed together in front of an audience.